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Aad, G.;
Abbott, B.;
Abbott, D. C.;
Abed Abud, A.;
Abeling, K.;
Abhayasinghe, D. K.;
Abidi, S. H.;
Abramowicz, H.;
Abreu, H.;
Abulaiti, Y.;
Abusleme Hoffman, A. C.;
Acharya, B. S.;
Achkar, B.;
Adam, L.;
Adam Bourdarios, C.;
Adamczyk, L.;
Adamek, L.;
Adelman, J.;
Adiguzel, A.;
Adorni, S.;
Adye, T.;
Affolder, A. A.;
Afik, Y.;
Agapopoulou, C.;
[...]
Measurement of the t$$ \overline{t} $$t$$ \overline{t} $$ production cross section in pp collisions at $$ \sqrt{s} $$ = 13 TeV with the ATLAS detector
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- Medientyp: E-Artikel
- Titel: Measurement of the t$$ \overline{t} $$t$$ \overline{t} $$ production cross section in pp collisions at $$ \sqrt{s} $$ = 13 TeV with the ATLAS detector
- Beteiligte: Aad, G.; Abbott, B.; Abbott, D. C.; Abed Abud, A.; Abeling, K.; Abhayasinghe, D. K.; Abidi, S. H.; Abramowicz, H.; Abreu, H.; Abulaiti, Y.; Abusleme Hoffman, A. C.; Acharya, B. S.; Achkar, B.; Adam, L.; Adam Bourdarios, C.; Adamczyk, L.; Adamek, L.; Adelman, J.; Adiguzel, A.; Adorni, S.; Adye, T.; Affolder, A. A.; Afik, Y.; Agapopoulou, C.; [...]
- Erschienen: Springer Science and Business Media LLC, 2021
- Erschienen in: Journal of High Energy Physics
- Sprache: Englisch
- DOI: 10.1007/jhep11(2021)118
- ISSN: 1029-8479
- Schlagwörter: Nuclear and High Energy Physics
- Entstehung:
- Anmerkungen:
- Beschreibung: <jats:title>A<jats:sc>bstract</jats:sc> </jats:title><jats:p>A measurement of four-top-quark production using proton-proton collision data at a centre-of-mass energy of 13 TeV collected by the ATLAS detector at the Large Hadron Collider corresponding to an integrated luminosity of 139 fb<jats:sup><jats:italic>−</jats:italic>1</jats:sup> is presented. Events are selected if they contain a single lepton (electron or muon) or an opposite-sign lepton pair, in association with multiple jets. The events are categorised according to the number of jets and how likely these are to contain <jats:italic>b</jats:italic>-hadrons. A multivariate technique is then used to discriminate between signal and background events. The measured four-top-quark production cross section is found to be <jats:inline-formula><jats:alternatives><jats:tex-math>$$ {26}_{-15}^{+17} $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msubsup> <mml:mn>26</mml:mn> <mml:mrow> <mml:mo>−</mml:mo> <mml:mn>15</mml:mn> </mml:mrow> <mml:mrow> <mml:mo>+</mml:mo> <mml:mn>17</mml:mn> </mml:mrow> </mml:msubsup> </mml:math></jats:alternatives></jats:inline-formula> fb, with a corresponding observed (expected) significance of 1.9 (1.0) standard deviations over the background-only hypothesis. The result is combined with the previous measurement performed by the ATLAS Collaboration in the multilepton final state. The combined four-top-quark production cross section is measured to be <jats:inline-formula><jats:alternatives><jats:tex-math>$$ {24}_{-6}^{+7} $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msubsup> <mml:mn>24</mml:mn> <mml:mrow> <mml:mo>−</mml:mo> <mml:mn>6</mml:mn> </mml:mrow> <mml:mrow> <mml:mo>+</mml:mo> <mml:mn>7</mml:mn> </mml:mrow> </mml:msubsup> </mml:math></jats:alternatives></jats:inline-formula> fb, with a corresponding observed (expected) signal significance of 4.7 (2.6) standard deviations over the background-only predictions. It is consistent within 2.0 standard deviations with the Standard Model expectation of 12<jats:italic>.</jats:italic>0 ± 2<jats:italic>.</jats:italic>4 fb.</jats:p>
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